;; -*-Scheme-*-

;;************************************************************************/
;;*                                                                      */
;;* Copyright (c) 2003-2009 Vladimir Tsichevski <tsichevski@gmail.com>   */
;;*                                                                      */
;;* This file is part of bigloo-lib (http://bigloo-lib.sourceforge.net)  */
;;*                                                                      */
;;* This library is free software; you can redistribute it and/or        */
;;* modify it under the terms of the GNU Lesser General Public           */
;;* License as published by the Free Software Foundation; either         */
;;* version 2 of the License, or (at your option) any later version.     */
;;*                                                                      */
;;* This library is distributed in the hope that it will be useful,      */
;;* but WITHOUT ANY WARRANTY; without even the implied warranty of       */
;;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU    */
;;* Lesser General Public License for more details.                      */
;;*                                                                      */
;;* You should have received a copy of the GNU Lesser General Public     */
;;* License along with this library; if not, write to the Free Software  */
;;* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 */
;;* USA                                                                  */
;;*                                                                      */
;;************************************************************************/

(module
 html-form-adapter
 (import http-cgi)
 (export
  (make-alist-adapter name::symbol #!key
                      registry
                      from
                      to)
  )
 )

(define(make-alist-adapter name::symbol
                           #!key
                           registry
                           from
                           to)
  (let((registry (or registry 'current-http-query)))
    `(define(,name . args)
       (let*((asslist(,registry))
             (found(assq ',name asslist)))
         (match-case
          args
          (()
           (and found
                ,(if from
                     `(,from (cdr found))
                     '(cdr found))))
          
          ((?value)
           (let((value
                 ,(if to
                      `(,to value)
                      'value)))
             (if found
                 (set-cdr! found value)
                 (,registry (cons(cons ',name value)asslist))))))))))

